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MHT CET202014 Oct 2020Evening ShiftMathematicsMatricesActual

The value of x such that the matrix [ array lll x & 2 & 3 4 & 5 & 6 2 & 3 & 5 array ] is not invertible is

Options

  1. A-10 7
  2. B7 10
  3. C-7 10
  4. D10 7

Correct answer

D. 10 7

Step-by-step solution

For given matrix to be invertible, we write array l | array lll x & 2 & 3 4 & 5 & 6 2 & 3 & 5 array |=0 x(25-18)-2(20-12)+3(12-10)=0 7 x-16+6=0 x= 10 7 array

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